Yep, you gotta think like a Dorf. Stout is best. Precision is an indication of pride of workmanship. At least that's how I envision them. That's not to say they don't create some gorgeous items of craftsmanship but if it's defective or weak it's scrap, no arguments. Only the best leaves the doors of the workshop and no Dwarf would ever want to gaze upon a crummy design. It's an assault to the senses.

I don't see a lot of circles except where necessary. Squares etc as mentioned already. If a tunnel is worth digging and is going to be permanent then it's worth doing it right. Your name is attached to everything you build so unless you want to look like a putz to the entire clan or nation you better do it right. Short, squat and sturdy is a beautiful thing to their eye.

Just my .02 cents on how they see their world.